Five-Phase Induction Motor DTC-SVM Scheme with PI Controller and ANN Controller

AbstractThis paper analyze design of space vector modulation based direct torque controlled (DTC-SVM) five-phase induction motor incorporated with ANN controller and has given a comparison with PI controller. This ANN controller is employed to improve the control performance parameters such as reducing torque & flux ripple, reducing the settling and rise time compare to that of PI controller. The modelling and simulation is performed in MATLAB, it shows that with intelligent controlled the performance parameters have been improved and drive system could be operated at low speed. The proposed model is less complex, require a single ANN controller for decoupled flux and torque controlled

Development of a Fed-Batch Process to Produce Beta-Carotene Using Engineered Saccharomyces Cerevisiae

Biocatalysts have been increasingly targeted to produce bio-fuels, pharmaceuticals and synthetic and natural chemicals due to a rising interest in sustainability and safety. The use of biocatalysts can eliminate the need for brute chemical synthesis and the toxic materials utilized in the process. Beta-carotene is a favorable candidate for microbial production as it is naturally produced in several different organisms and the pathway of production is well characterized. A brightly colored pigment which is used in a wide array of industries such as nutraceuticals, food and cosmetics, beta-carotene has a predicted market value of 247 million dollars by 2019. This work focuses on applying upstream and midstream approaches to maximize titer, yield and productivity of beta-carotene production under fed-batch operation using a carotenoid hyper-producer (SM14), an engineered strain of Saccharomyces cerevisiae. Bench-top bioreactor experiments determined ethanol feeding, when compared to glucose feeding, results in a 64% improvement in productivity. Glucose and ethanol feeding increased the maximum titer to 179 mg/L which is a 44% improvement when compared to batch experiments. In addition, yield was increased to 21 mg/g DCW, a 22% improvement compared to batch results. Response Surface Methodology (RSM) was utilized to optimize minimal YNB media for maximum biomass and titer production. Sixteen different compositions were studied and the analysis showed that optimal composition results in an improvement of 243.35% in biomass production, 198.21% in titer and 106.49% in productivity

Analysis of TIG Welding Process on Mechanical Properties and Microstructure of Aa6063 Aluminum Alloy Joints

Present work pertains to testing of mechanical properties and microstructure of AA 6063 Aluminium alloy joints by Tungsten inert gas (TIG) welding. By varying weld current and maintaining all parameters constant hardness, impact and tensile strength of the welded joints are tested and finally, microstructure details are analyzed. The results showed mechanical properties linearly varies with increase in weld current

A Well-Organized Revocable Data Access Control for Multi-Authority Cloud Storage

— Ensuring data security while accessing data in the cloud is a paramount importance. Due to data outsourcing and untrusted cloud servers, the data access control becomes a challenging issue in cloud storage systems. Ciphertext-Policy Attribute-based Encryption (CP-ABE) is regarded as one of the most suitable technologies for data access control in cloud storage, because it gives data owners more direct control on access policies. However, it is difficult to directly apply existing CP-ABE schemes to data access control for cloud storage systems because of the attribute revocation problem. In this paper, we design an expressive, efficient and revocable data access control scheme for multi-authority cloud storage systems, where there are multiple authorities co-exist and each authority is able to issue attributes independently. Specifically, we propose a revocable multi-authority CP-ABE scheme, and apply it as the underlying techniques to design the data access control scheme. Our attribute revocation method can efficiently achieve both forward security and backward security. The analysis and simulation results show that our proposed data access control scheme is secure in the random oracle model and is more efficient than previous works

Personal assistive robot

This system creates a digital map of a one-story living space and then retrieves objects from within that space. It must be able to detect obstacles as well as recognize and locate small objects of interest such as keys, remote controls, glasses, and pillboxes. The system communicates with a mobile device in order to display a graphical user interface with the map, object locations, and labels. The device can retrieve an object as requested by the user and present it to them in a safe, intuitive manner. The objects in question must be laying on a flat surface, unattached, and no more than four feet from floor-level. The objects can weigh up to one pound. Due to the COVID-19 pandemic, this project was required to shift focus near its halfway point. Physical robot development was abandoned, and the primary deliverable was replaced with a "proof-of-concept" design to be demonstrated virtually in a simulated 3D environment. All design parameters from the original robot were ported into a virtual representation to the greatest accuracy available, and all of the same design functionality was explored and attempted within the simulation. The only functionality that was abandoned was that of the GUI and control application for mobile devices; however, the GUI design was still completed for demonstration purposes

Thermal Distillation Using Heat Localization

Thermal desalination using solar energy is one of the most propitious application in renewable energies and a viable solution for treating the waste water to meet the present-day water standards. This work demonstrates the re-using of waste water by using the laboratory designed low-cost desalination system under 1 sun solar concentration condition, a double layer structure comprising carbon foam and exfoliated graphite are used for solar thermal conversion, Where heat is localized to top layer get heated and evaporated due to the capillary action of the porous structure at the top, vapor is allowed to condense and fresh water is collected. This is eco-friendly and low cost due to solar energy and grid-free operations and great option for the semi- arid and drought prone regions

Burden of Persistent Vomiting With Cannabis Use Disorder: Report From 55,549 Hospitalizations in the United States

Background With increase in incidence rate of persistent vomiting (PV) in the post-legalization period it is important to understand adverse effects of cannabis use and its relationship with PV. Objective We investigated the relationship between cannabis use disorder (CUD) and PV-related hospitalization. Methods A Nationwide Inpatient Sample was analyzed from 2010 to 2014 for patients (aged 15–54 y) with a primary diagnosis of PV (N = 55,549), and a comparison was made between patients with the International Classification of Diseases, Ninth Edition classification of CUD versus non-CUD cohorts. We used logistic regression to study the odds ratio between CUD and PV. Results The number of PV-related hospitalizations with CUD had a significantly increased trend (P < 0.001), with a 286% increase over 5 years. A higher proportion of these patients with CUD were younger (15–24 y), female, and African American/Hispanic. In regression analysis, cannabis was associated with a seven-fold higher odds (95% confidence interval: 6.931–7.260) of PV-related hospitalization. Conclusions This study found that CUD was independently associated with a 609% increased likelihood of PV-related hospitalization, and this association persisted even after adjusting for known risk factors and other substances

Arrhythmia-related Hospitalization and Comorbid Cannabis Use Disorder: Trend Analysis in US Hospitals (2010-2014)

Objective To study the trends of arrhythmia hospitalizations with cannabis use disorders (CUDs) in terms of demographic characteristics and inpatient outcomes. Methods We used the nationwide inpatient sample (NIS) data during the post-legalization period (2010-2014) and included 570,556 arrhythmia inpatients (age, 15-54 years), and 14,426 inpatients had comorbid CUD (2.53%). We used the linear-by-linear association test and independent-sample T-test for assessing the change in hospital outcomes in inpatients with CUD. Results Arrhythmia hospitalizations with CUD increased by 31% (2010-2014). This increasing trend was seen in adults (45-54 years, P < 0.001) and was predominant in males (77.6%). Hypertension (40.6%), hyperlipidemia (17.6%), and obesity (15%) were prevalent medical comorbidities with variable trends over the five years. Among substance use disorders, tobacco (50.9%), and alcohol (31.4%) were major comorbidities with a variable trend (P = 0.003 for each). There was a 71.4% increase in the inpatient mortality rate between 2010 (0.7%) and 2014 (1.2%). The mean length of stay was three days, and the total hospitalization charges have been increasing (P < 0.001), averaging $35,812 per hospital admission. Conclusion Chronic cannabis use or abuse worsens hospitalization outcomes in arrhythmic patients, and more clinical studies are needed to study the causal association between these conditions due to the rising mortality risk

Problematic Cannabis Use and Risk of Complications in Patients with Chronic Hepatitis C

Objectives To evaluate the risk of complication in hospitalized chronic hepatitis C (CHC), patients with cannabis use disorder (CUD). Methods We conducted a retrospective study using the nationwide inpatient sample (NIS), and included 31,623 patients (age 15-54) with a primary international classification of diseases, ninth revision (ICD-9) diagnosis for CHC and grouped by co-diagnosis of CUD (1101, 3.5%). Logistic regression model adjusted for confounders was used to evaluate the odds ratio (OR) of CUD and complications during CHC hospitalization. Results Comorbid CUD was prevalent in males (73.2%), Caucasians (59.9%), and from low-income families (65.7%). The most prevalent complications in patients with CUD were ascites (44.9%), alcoholic cirrhosis (42.8%) and non-alcoholic cirrhosis (41.1%). The odds of association for hepatic encephalopathy was 2.2 times higher (95% CI 1.477-3.350) in 2.8% CHC inpatients with CUD compared to 1.2% non-CUD inpatients. Hepatic encephalopathy had higher odds of association with a male by 1.4 times (95% CI 1.094-1.760), and African American by 1.7 times (95% CI 1.293-2.259). Conclusion CUD is significantly associated with 122% increased likelihood for hepatic encephalopathy that may worsen overall hospitalization outcomes in CHC patients. Hence, we need to consider the complex relationship between CUD and CHC and manage them optimally to improve the health-related quality of life